<template>
  <NavBar>
    <div slot="left" class="back" @click="backClick">
      <img src="@/assets/img/common/back.svg">
    </div>
    <div slot="center" class="title">
      <div
        class="title-item"
        v-for="(item,index) of titles"
        :key="index"
        @click="titleClick(index)"
        :class="{active:currentIndex===index}">
        {{item}}
      </div>
    </div>
  </NavBar>
</template>

<script>
  import NavBar from "@/components/common/navbar/NavBar";

  export default {
    name: "DetailNavBar",

    components: {
      NavBar
    },
    props: ["i"],
    data() {
      return {
        titles: ["商品", "参数", "评论", "推荐"],
        currentIndex: 0
      };
    },
    methods: {
      titleClick(index) {
        this.currentIndex = index;
        this.$emit("titleClick", index);
      },
      backClick() {
        this.$router.back();
      }
    },
    watch: {
      i(i) {
        this.currentIndex = i;
      }
    }
  }
</script>

<style scoped>
  .title {
    display: flex;
    font-size: 13px;
  }

  .title-item {
    flex: 1;
  }

  .active {
    color: var(--color-high-text);
  }

  .back {
    margin-top: 5px;
  }

</style>
